滇池太湖新银鱼的生长特性与资源量关系的研究

STUDY ON THE CORRELATION BETWEEN THE GROWING CHARACTERS OF Neosalanx taihuensis AND ITS RESOURCES IN LAKE DIANCHI

为了滇池中太湖新银鱼（ＮｅｏｓａｌａｎｘｔａｉｈｕｅｎｓｉｓＣｈｅｎ）达到稳产、高产、优质、高效的目的，管理部门急需寻求一个合理的资源量平衡点。经３１个月的连续采样调查，应用ＶｏｎＢｅｒｔａｌａｎｆｙ生长方程，得到太湖新银鱼１９８９年和１９９０年生长方程分别为：Ｌ＝６．７０〔１－ｅ－０．１９８（ｔ－０．２２５）〕、Ｗ＝１．７８〔１－ｅ－０．１９８（ｔ－０．２２５）〕３和Ｌ＝７．４８〔１－ｅ－０．１７３（ｔ＋０．０６４）〕、Ｗ＝２．７６〔１－ｅ－０．１７３（ｔ＋０．０６４）〕３。据此拟合出体重与种群密度关系Ｗ＝１．０４７－０．６７１ｌｇＣ，种群密度与资源量关系Ｆ＝１９９９．３６Ｃｅ－０．２０４５，最终演译出资源量平衡点在１８４７ｔ。相应体重１．０ｇ／尾；密度指标１．１７５尾／ｍ３；捕捞时间在８月。该研究结果已成为滇池渔业管理的努力目标。

The salangid fish,Neosalanx taihuensis,has become a major export fish product in Yunnan. In order to approach steady abundant harvest of N. taihuensis with high quality in Lake Dianchi,it is urgent to set an appropriate balance point for the resources of N. taihuensis in the lake. After successive 31-month sampling investigations and applying the Von Bertalanffy growing equation,We obtained N. taihuensis growing eqs. L=6.07 1-e -0.198(t-0.225) ,W=1.78 1-e -0.198(t-0.225) 3 for 1989 and L=7.48 1-e -0.173(t+0.064) . W=2.76 1-e -0.173(t+0.064) ] 3 for 1990. Based on the two eqs. we fitted out the correlations between body F=1999.36 C e -0.2045 ,and finally we deduced the resource-balance point to be 1847 t,correspondingly the body weight 1.0 g per fish;density 1.175 fish/m 3 ,the fishing season is Aug. These results have been the goal for the Kunming Department of Fishery Management and being tested and improved in practice.